In a stunning revelation this week, it was disclosed that former IRS official Lois Lerner told colleagues, “we need to be cautious about what we say in emails” and then proceeded to ask the IRS IT department, in an e-mail, “if [instant messaging] conversations were also searchable.” When she was told they were not, she e-mailed back, “Perfect.” This is a smoking gun e-mail in that it makes plain she had a cover-up in mind. There is no other plausible explanation.